Body Control Module: Service and Repair

BODY CONTROL MODULE REPLACEMENT

REMOVAL PROCEDURE
1. Open the convertible top.

IMPORTANT:
- The ignition switch should be in the OFF position when connecting or disconnecting the connectors to the body control module (BCM).
- Always disconnect the gray connector FIRST, the white connector SECOND, the black connector THIRD, the blue connector FORTH, and the brown electrical connector LAST.
- Always connect the brown electrical connector FIRST, the blue connector SECOND, the black connector THIRD, the white connector FORTH, and the gray connector LAST.
- Do not open the BCM housing. The module does not have any serviceable components. The module may be replaced only as an assembly.

2. Disconnect the negative battery cable.

CAUTION: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

For Vehicles equipped with OnStar (RPO UE1) with Back Up Battery:
The Back Up Battery is a redundant power supply to allow limited OnStar functionality in the event of a main vehicle battery power disruption to the VCIM (OnStar module). Do not disconnect the main vehicle battery or remove the OnStar fuse with the ignition key in any position other than OFF. Retained accessory power (RAP) should be allowed to time out or be disabled (simply opening the driver door should disable RAP) before disconnecting power. Disconnecting power to the OnStar module in any way while the ignition is On or with RAP activated may cause activation of the OnStar Back-Up Battery (BUB) system and will discharge and permanently damage the back-up battery. Once the Back-Up Battery is activated it will stay on until it has completely discharged. The BUB is not rechargeable and once activated the BUB must be replaced.

3. Remove the rear upper garnish molding.
4. Loosen and move the floor console forward to reveal the BCM electrical connectors. Refer to Console Replacement in Instrument Panel, Gages, and Console.




5. Release the tabs (2) retaining the BCM mounting bracket to the console bracket.
6. Release the tab (1) retaining the BCM mounting bracket to the console bracket.




7. Remove the BCM and bracket assembly from the console bracket (1).




8. Disconnect the gray connector (2) from the BCM.
9. Disconnect the white connector (1) from the BCM.
10. Disconnect the black connector (5) from the BCM.
11. Disconnect the blue connector (4) from the BCM.
12. Disconnect the brown connector (3) from the BCM.




13. Remove the BCM from the vehicle.
14. If replacing the BCM, release the retaining tabs (1) and remove the mounting bracket from the BCM.

INSTALLATION PROCEDURE




1. If replacing the BCM, install the mounting bracket on the BCM. Ensure the retaining tabs (1) are fully seated.




2. Connect the brown connector (3) to the BCM.
3. Connect the blue connector (4) to the BCM.
4. Connect the black connector (5) to the BCM.
5. Connect the white connector (1) to the BCM.
6. Connect the gray connector (2) to the BCM.




7. Position the BCM and bracket assembly to the console bracket (1).




8. Install the tab (1) retaining the BCM mounting bracket to the console bracket.
9. Install the tabs (2) retaining the BCM mounting bracket to the console bracket.
10. Install the floor console.
11. Install the rear upper garnish molding.
12. Connect the negative battery cable.
13. If installing a replacement BCM, program the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration. Programming and Relearning
14. Close the convertible top.